Adhesive cement.



UNITED STATES PATENT OFFICE.

JOHN T. SLOUGH, OF WOODSTOCK, CANADA.

ADHESIVE CEMENT.

:ZPECIFlGATION forming part of Letters Patent No. 709,651, dated September 23, 1902.

Application filed February 17, 1902. Serial No. 94,494. (No specimens.)

T0 (1,77 1071/0111 it may concern:

Be it known thatLJOHNT. SLOUGtLcheesemaker, of the city oftVoodstock, in the county of Oxford and Province of Ontario, Canada, have invented a certain new and useful composition of matter to be used in the manufacture of furniture and veneer-work and other articles in which glue or ccmentis used in the making or fastening togelher; and I do hereby declare that the following is a full, clear, and exact description of the same.

The nature of my invention consists of treating or combining with sixteen parts, by weight, of casein or skim-milk cheese from one-half to one and one-half parts of alkali, preferably pure, (caustic soda,) an article which dissolves the casein or renders it soluble when mixed thoroughly with from thirtysix to sixty-five parts of pure water and heating at a temperature of from 150 to 212 Fahrenheit, to which solution or composition of casein and solvent two parts of neutralized infusible oxid, preferably oxid of magnesia, are added or have been added, the oxid being productive of greater adhesiveness and causing the casein solution to set and harden in a short time after it is applied to a surface or between jointed surfaces that are to beheld together. When the above articles have been either separately or combinedly mixed together and heated at the temperature of from 150 to 212 in a double boiler until a particle taken from the boiler upon the finger will string between the thumb and forefinger, it is ready for use. The composition must be kept near boiling-point as long as there is a tendency for the casein to become thick in cooling, after which the temperature may be lowered. The right proportion of water (thirty-six or moreparts) must bekeptinboiler at all times. The proportion of water is governed by the proportion of alkali used. The casein is most perfectly dissolved with upward of one and one-half parts of alkali and is thinly fluid with thirty-six parts of boiling water, whereas with one-half part of alkali and about sixty-four parts of boiling water the casein would not he so thoroughly dissolved, but of sufficiently fluid for use and possesses the following advantages: It resists moisture and heat, is practically damp and heat proof, and covers more surface.

The casein or skim-milk cheese as used in my composition is produced by separatorcreameries or butter-factories. The skim milk as it comes from the separator at a temperature of about is curdled by adding from two to four ounces of rennet extract to each one thousand pounds of skim-milk. If skim-milk is nearly sour when rennet extract is added, the smallest proportion-two ouncesof rennet extract will be sufficient, the idea being to have the milk curded firmly, that it may be cut into small tubes or curds, further heated to a temperature of about curds kept in agitation until but sufficient moisture is retained in the particles after whey is run off, that they will mat together When put into regular cheese-press, and pressed about twelve hours. Cheese or curd is then taken from the press, broken up and ground, or the matter-pressed curds or cheese triturated byacylindricalgrater, or the curds may be cooked at a temperature of about kept separate by agitation until they become hard, after which the whey is run off, the curds put in a dry airy place, preferably over racks, where they are kept in separate particles, when they are ground. In either case lactic acid should have developed sufficiently in whey before it is run off that it is discernible in the curd by a particle of curd stringing from a hotiron. The alkali (caustic soda) as used according to my invention is preferably commercially or chemically pure. The neutralized infusible oXid, preferably oxid of magnesia, is the commericial article.

I am aware that suggestions have been made as to how casein or skim-milk cheese could be combined with wood-ashes and lime as a cement; but these have not met with practical success. I therefore do not claim to be the discoverer of casein as containing adhesive properties, but claim to be the in ventor of this the only practical composition of casein glue or cement which is made with an alkali, preferably pure, (caustic soda,) and neutralized infusible oxid, preferably oxid of magnesia; nor would I be understood as including with this application for a patent the process for preparing the casein.

What I claim as my invention, and desire to secure by Letters Patent, is-

1. The herein-described composition of matter consisting of casein, combined with an alkalinity, preferably oxid of magnesia, two 10 kali, infusible oxid, free from acidity or alparts, water substantially thirty-six parts as kalinity, preferably oxid of magnesia, and described. boiling water. Woodstock, February 5, 1902.

2. Theherein-described composition of matter for casein glue or cement, consisting of JOHN SLOUGH' casein, sixteen parts, alkali, preferably pure Witnesses: (caustic soda) one-half to one and one-half FRANCIS R. BALL, parts, infusible oxid, free from acidity or al- R. N. BALL. 

